In order to measure a Frequency Response / Phase Response, you'll need some more Devices:

• A Sawtooth Generator, 1 ... 50 Hz, Amplitude and Offset to be adjusted
• A VCO, MiniCircuits has a broad range of suiteable devices :-)
• A Power Splitter
• An Oscilloscope with X-Y capability, Set y-input to "INVERT"
• A power Supply :-)

Here we test the setup with (just) an attenuator. (MAGNITUDE)
A Voltage Drop (inverted !) of 20 dB x 27.5 mV (typically) = 550 mV may be observed.

Here we test the setup with a Bandpass at 70 MHz (ZFBP-70-S+ from MiniCircuits).
Scope is in X-Y Mode, as low sweeprates are needed for the filter to settle.
VCO is JTOS-150 with a Buffer.

Do not sweep to fast. The filter (D.U.T.) needs time to settle. Maybe change the lowpass consisting of R2, R3 and the feedthrough capacitor.

No, we do not sell the PCB. In case you want it, send the Target-Project File to the PCB-Manufacturer of you choice. E.g. Beta Layout

Resisitive Power Splitter have an Insertion Loss of 6 dB. Ensure your VCO delivers
+ 6 dBm to use maximum dynamic range of the circuit.

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